Hook size
7 mm crochet hook
A 7 mm crochet hook has no standard US letter size and has old UK size 2. It is the recommended hook range for bulky (5) yarn, and crocheters typically choose it for bulky scarves, chunky hats and quick cozy throws. Always check gauge with a swatch, because tension varies between crocheters.
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| Metric | US | Old UK | Suits yarn weights |
|---|---|---|---|
| 7 mm | — | 2 | #5 Bulky |
What is a 7 mm crochet hook in US and UK sizes?
A 7 mm hook is not given a standard US letter size and old UK size 2. Metric millimetres are the only measurement that is the same on every brand, so check the mm size stamped on the hook.
| Metric | US | Old UK | Yarn weights |
|---|---|---|---|
| 6 mm | J-10 | 4 | #4 |
| 6.5 mm | K-10½ | 3 | #4, #5 |
| 7 mm (this hook) | — | 2 | #5 |
| 8 mm | L-11 | 0 | #5 |
| 9 mm | M/N-13 | 00 | #5, #6 |
What yarn weight goes with a 7 mm hook?
A 7 mm hook is typically used with bulky (#5) yarn. Bulky yarn gives about 8–11 sc per 4 in / 10 cm and suits chunky hats, scarves and cowls, quick throws.
| Weight | Also called | Crochet gauge | Recommended hooks |
|---|---|---|---|
| #5 Bulky | Chunky, Craft, Rug, 12-ply (AU/NZ) | 8–11 sc per 4 in / 10 cm | 6.5–9 mm |